[v15,14/17] iomap: Convert iomap_read_inline_data to take a folio

Commit Message

Matthew Wilcox (Oracle) July 19, 2021, 6:39 p.m. UTC

Inline data is restricted to being less than a page in size, so we
don't need to handle multi-page folios.

Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Reviewed-by: Darrick J. Wong <[e-mail]>
---
 fs/iomap/buffered-io.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

Comments

Christoph Hellwig July 20, 2021, 7:16 a.m. UTC | #1

On Mon, Jul 19, 2021 at 07:39:58PM +0100, Matthew Wilcox (Oracle) wrote:
> Inline data is restricted to being less than a page in size, so we
> don't need to handle multi-page folios.

Looks good,

Reviewed-by: Christoph Hellwig <[e-mail]>

Patch

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 4b02337009bc..23ee86aba9d6 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -194,25 +194,25 @@  struct iomap_readpage_ctx {
 	struct readahead_control *rac;
 };
 
-static void
-iomap_read_inline_data(struct inode *inode, struct page *page,
+static void iomap_read_inline_data(struct inode *inode, struct folio *folio,
 		struct iomap *iomap)
 {
 	size_t size = i_size_read(inode);
 	void *addr;
 
-	if (PageUptodate(page))
+	if (folio_test_uptodate(folio))
 		return;
 
-	BUG_ON(page_has_private(page));
-	BUG_ON(page->index);
+	BUG_ON(folio_test_private(folio));
+	BUG_ON(folio->index);
+	BUG_ON(folio_multi(folio));
 	BUG_ON(size > PAGE_SIZE - offset_in_page(iomap->inline_data));
 
-	addr = kmap_atomic(page);
+	addr = kmap_local_folio(folio, 0);
 	memcpy(addr, iomap->inline_data, size);
 	memset(addr + size, 0, PAGE_SIZE - size);
-	kunmap_atomic(addr);
-	SetPageUptodate(page);
+	kunmap_local(addr);
+	folio_mark_uptodate(folio);
 }
 
 static inline bool iomap_block_needs_zeroing(struct inode *inode,
@@ -237,7 +237,7 @@  iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 
 	if (iomap->type == IOMAP_INLINE) {
 		WARN_ON_ONCE(pos);
-		iomap_read_inline_data(inode, &folio->page, iomap);
+		iomap_read_inline_data(inode, folio, iomap);
 		return PAGE_SIZE;
 	}
 
@@ -616,7 +616,7 @@  static int iomap_write_begin(struct inode *inode, loff_t pos, size_t len,
 
 	page = folio_file_page(folio, pos >> PAGE_SHIFT);
 	if (srcmap->type == IOMAP_INLINE)
-		iomap_read_inline_data(inode, page, srcmap);
+		iomap_read_inline_data(inode, folio, srcmap);
 	else if (iomap->flags & IOMAP_F_BUFFER_HEAD)
 		status = __block_write_begin_int(page, pos, len, NULL, srcmap);
 	else